mathis



(No Model.)

S. MATHIS.

, REGULATOR FOR ELECTRIC LAMPS. No. 372,986. Patented Nov. 8, 1887.

UNITED STATES PATENT QFFICEO SYLVAIN MATHIS, OF MORLANYVELZ, BELGIUM.

I-lEGULATOR FOR ELECTRIC LAMPS.

SPECIFICATION forming part of Letters Patent No. 372,986, dated November 8, 1887.

Application filed August 22 1887. Serial No. 247,588. (No model.) Patented in Belgium January 27, 1887, No. 75,980 in France February 19,1887, No. 168,854; in Luxemburg August 2, 1887, No. 867; in England August 4, 1887, No. 10,740, and in Italy August 5, 1887, No. 1,941.

To all whom it may concern.-

Be it known that I, SYLVAIN MATHIS, a subject of the King of Belgium, residing at Morlanwelz, Belgium, electrician to the coal-mines of Mariemont, and of Bascoup, have invented certain new and useful Improvements in Regulators for Electric Lamps, of which the following is a specification.

This invention relates to regulators for are lamps of the class in which the uniformity of the arc is obtained by the descent of the upper carbon. This motion is effected in the regulator, hereinafter described, by a lever mechanism, which, by means of a clamp, actuates the carbon-holder.

In the accompanying drawings, Figure l is a side elevation of the impr'ovedrcgulator. Fig. 2 is a plan view of the same.

The said regulator comprises a bell-crank lever, L L, turning upon a fixed point, 0, of the lamp. In holes 0, at the end of the vertical arms L of this bell-crank lever, is pivoted a horizontal clamp-lever, E, the clamp F of which has an upper and lower shoe, which is adapted to alternately embrace the carbonholder T, placed at the center of the apparatus. The horizontal extremity of the bellcrank lever L L is loaded with a counterweight, P; but, instead of the latter, it may, if desired, be acted upon by a spring or an electromagnet. A third lever, constituting a double rocking lever, O D, is pivoted at the fixed points 0 of the lamp, which are situated at such a height, relatively to the pivot O of the bell-crank lever, that the clamp-lever E shall be between the two arms of the double rocking lever G D. The latter is provided on its left-hand arms with an armature, A, and an adjusting-screw, and on its right-hand arms withfa stop, D, which, by the action of a spring, R, is caused to bear against a collar, N, fixed at a suitable height upon a rod of the lamp. A11 arm extending from this collar is fitted with a screw, V, which makes contact with a flat spring, 1", thereby closing the circuit of a shunt which passes to an electromagnet, B, arranged at a suitable distance above the armature A.

The operation of the regulator is as follows that is to say, when the lamp is not in operation, the carbons touch each other, and the extremity L of the bell-crank-lever L L is kept in a raised position by a support or rod, t, arranged below the same, so that the shoes of the clamp-lever E F are removed from the upper carbon-holder, T. As soon as a current passes through thelamp it traverses an electromagnet having coils of thick wire, which immediately separates the carbons for the formation of the arc. At the same time the extremity L of the bell-crank lever L L leaves its support if, and the counterweight P, acting upon the said arm, presses the extremity F of the clamp-lever E E, which is consequently kept suspended in the desired position. As the carbons are consumed the resistance of the are becomes greater, which increases the power of the electro-magnet B, and the latter attracts its armature A, thus causing the rocking lever O D to swing upon its pivots 0' independently of the rest of the mechanism. At this moment the adj usting-screw V strikes against the extremity of the clamp-lever E, and causes the latter to swing in its turn independently of the bell-crank lever L L. During this motion of the clamp-lever E the lower shoe of the clamp F releases the carbon-holder T, while the upper shoe continues to press upon the same and causes it to descend. During the movement of the rocking lever O D the flat spring is separated from the screw V, so that the current passing through the coil of the electro-magnet B is interrupted until the spring R brings the rocking lever O D back to its normal position and establishes contact again. These motions continue until the normal length of the arc is restored.

All the motions of the mechanism above described are effected with such precision and sensitiveness that the differences in the length of the arc cannot be detected, and the light is thereiore always regular and steady.

What I claim is- A regulator for an arc lamp, consisting of a bell-crank lever L L, pivoted at O, the arm L of which is loaded with a counter-weight, P, or acted upon by a spring or an electro-magnet, while the vertical arm L carries the lever E, provided with the clamp F, actuating the carbon-holder T, in combination with a rocking lever, CD, pivoted at O", and provided at one passingthrough the eleetro-niagnet B, sub extremity with the armature A for the electrostantielly as described with reference to the magnet 15, and with the zuljusting-serew V, aetaccompanying drawings.

ing upon the lever E, and at the other ex- SYLVAIN MATHIS. 5 tremity with the stop D, the spring R, and also 1 Witnesses:

with the flat spring 0', which engages with the AUG. JOERISSEN,

screw V, to reestablish the derived current Jilo. STEINER. 

